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Why Your AC is Blowing Warm Air – 10 Reasons

Apr 24, 2023AC Tips, HVAC Tips0 comments

warm air AC

AC Blowing Warm Air in Your Home

Warm air is a nightmare for anyone living in the Phoenix metro area, thus, it is important to understand what causes your air conditioning system to incur problems. A unit can be replaced but this is often costly and can be prevented when the proper diagnostics are conducted or a regular check-up is performed. People often ask themselves: “What is causing my air conditioning to blow out hot air? And what can I do?”. 

Reasons your AC is Blowing Warm Air:

1. Fan Issues

A defective fan is one of the symptoms that is more noticeable. Whether your fan blades are not moving at all or the fan blades and motor are damaged, the system often has distinct rattling or buzzing noises. If the fan is having issues blowing the cool air throughout the house it will most likely warm up before it reaches its destination.

2. Refrigerant Leaks or Low Levels of Refrigerant 

Low levels of refrigerant can be due to leaks but finding leaks is not always an easy task. Indications of the location of the leak are hissing noises and ice forming around the area. Additionally, leaking refrigerant can damage important components such as the compressor. Without refrigerant, your AC will only blow warm air. Timely resolving a leak is therefore crucial. 

3. Congested Air Filters

Replacing your air filters on time can prevent dirt and dust from building up in your system. A congested air filter can cause your system to work too hard and blow hot air. The lifetime of your air filters can depend on your living conditions and need for clean air. Pets, outdoor air quality, and even the type of air filter can determine how quickly the filters will get clogged. It can widely depend from household to household when to replace your filters.

4. Malfunctioning Compressor

The compressor is an important component of your AC and can last a long time. However, when the compressor gives out the refrigerant is unable to turn itself into cool air. As it is a crucial component in the system it is essential to get the compressor serviced frequently.

5. Dirty or Frozen Evaporator Coils

Evaporator coils can get dirty over time or by dirty air filters. These coils normally soak up the heat as they are filled with refrigerant from the system. Debris will result in a blockage and the air will not be able to circulate around the coils resulting in the air not cooling properly.

6. Incorrect Thermostat Settings

A thermostat can have a wide range of settings which can be confusing at times. Firstly, check if the thermostat is not set to ‘Heating’ instead of ‘Cooling’. Secondly, the fan option should be on ‘Auto’ and not ‘ON’ as it will blow warm air between. Lastly, if the previous options did not work, it is possible your thermostat needs to be recalibrated. 

7. Clogged Drains

Over time dust, dirt and other debris starts to accumulate in the drain line of your air conditioner. This is normal as the condensate line is constantly humid but it starts to become a problem when it is obstructed. The water collected can overflow and flow back towards the AC which can damage your system and cause leaks inside walls and ceilings.

8. Blocked Outdoor AC Unit

As recommended by HVAC installers it is important to keep your unit free from any obstructions. The reason for this is to reduce the amount of dirt and debris accumulating in your AC. A frequent obstruction that is often forgotten about is overgrown greenery. Overgrown landscaping should be trimmed in order to keep your unit from overheating from debris.

9. Duct Leaks

A big enough hole in the ducts can lead to insufficient cooling of your home. Wear and tear, poor installation, or pests can create holes in your ductwork. This is why the upkeep and cleaning by a professional is essential to prevent your AC from blowing warm air.

10. The Lifespan of an AC Unit

The average lifespan of an AC unit is on average between 12-20 years. If your unit is not regularly serviced it can decrease performance and the number of years your unit will last. The system blowing hot air is one of the symptoms of a faulty AC unit. Where sometimes maintenance can do the trick it can happen your AC is due for replacement. We can advise which replacement unit will be the best fit for your home or business. 


It requires periodic ac check-ups for your A/C unit to operate at peak efficiency. Maintenance can partially be done by yourself but there is a limit to what you can do yourself as the warranty on your unit might be voided. Regular air conditioning check-ups are necessary to resolve the issues that cause your AC to blow out warm air but it can also save you money on your energy costs. If you want your air conditioner to last, a periodic check-up by a professional may be the best option for you. We recommend your HVAC system be serviced at least once a year. For extra tips and information consider following our facebook page.



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